Lewis reportedly popped the question last month, and Nicole said no, so he tried again this month, and she finally said yes. This is reportedly the fourth (!) time he had proposed to her. If at first you don't succeed...

"He got down on one knee, and Nicole finally accepted," says a source. "The plan is, they are going to live together in Switzerland and travel together when Lewis is racing."

"Lewis is doing his best to keep the news ­under wraps, but he is ­absolutely delighted," the insider adds. "Of course, this means her career will have to take a back seat for a while, but she is ready to support him on the track."

This is certainly an exciting time for Nicole, who was a judge on the X Factor in Season 1 and on X Factor UK in Seasons 9 and 10. She recently signed a record deal with Sony to produce her second solo album.